| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 5 |
2%
|
| 0 | No obstacle | 84 |
34.1%
|
| 1 | Minor obstacle | 30 |
12.2%
|
| 2 | Moderate obstacle | 43 |
17.5%
|
| 3 | Major obstacle | 58 |
23.6%
|
| 4 | Very severe obstacle | 26 |
10.6%
|